Method of making abrasive cutoff wheels



Dec, 28, 1948. H. v. ALLISON 2,457,516

METHOD OF MAKING ABRAS IVE CUTOFF WHEELS Filed May 10, 1947 ATTORNEYPatented Dec. 28,. 1948 METHOD OF G ABRASIVE C UTOFF WHEELS Hugh V.Allison, Fairfield Allison Company, Brid tion of Connecticut geport,Gonn a corpora- ConhQ, 'a'ssignor to The Application May 10, 1947,Serial No. 747,291

1 This invention relates to new and useful improvements in abrasivecut-oil wheels and methods of makingthesame.

An-object of the invention is to provide a method whereby large diameterabrasive cut-ofi wheels may be made without the necessity of employinglarge and expensive equipment.

Another object is to provide a simple and inexpensive method of makinganimproved construction of abrasive cut-ofi wheel including a featurewhereby the wheel will carry large quantities of a coolant into a outbeing made.

A further object is to provide an improved construction of abrasivecut-off wheel including a feature ofconstruction whereby the wheel whenin use will carry large quantities of a coolant into acut being made.

Other objects and advantages of the invention will become apparent froma consideration of the following detailed description taken inconnection with the accompanying drawing wherein a satisfactoryembodiment of the invention is shown. However, it is to be understoodthat the invention is not limited to the details disclosed but includesall such variations and modifications as;fall within the spirit of theinvention and the scope of the appended claims. 1

In the drawing:

Fig. l is a plan view illustrating the present method of making anabrasive-cut-off wheel;

Fig. ;2 is a front elevational viewof a wheel made in accordance withthe present invention, the view being on alarger scale; Fig. 3 is adetailed sectional view taken as along the line 33 of Fig. 2, the Viewbeing on a further enlarged scale; and

Fig. 4 is a detailed sectional view on the scale of Fig. 3 and taken asalong the line 4-4 of Fig. 2. Abrasive cut-off wheels or discs ofrelatively large diameter, as for example, a diameter of 36",, are indemand. However, the manufacture of such wheels as heretofore practisedinvolves the use of relatively large and expensive equipment notavailable to the smaller manufacturers of, abrasive cut-ofi wheels. Thepresent invention provides a method whereby abrasive cut-off wheels ofsubstantially any desired diameter may be made without the necessity ofthe manufacturer beingprovided with large, expensive equipment. Inaddition, the abrasive cut-off wheel resulting from the practise of thepresent novel method has many desirable characteristics not to be foundin abrasive cut-off wheels as heretofore manufactured.

1 Referring in detailto the drawing and at first 8'Claims. (Cl. 51293) Imore particularly to Fig. 1, an abrasive cutwff wheel is manufacturedaccording to the present invention by preparing a series of strips ofabrae sive grain and a suitable bond. Depending on the use to which theabrasive cut-oil wheel is to-be put, the bond employed may be resinoid,rubber, or the like. In making a wheel of say 36" iam, eter, a pair ofsaid strips I0 and I I of 'approxi mately 19 in width arelayed up inside-by-side relation with their edges spaced apart as at I2. Thesestrips are layed in parallel or substantially parallel relation and thespace l2 may be up to a quarter of an inch. I

Then a second pair of strips I3 and I4 of the abrasive grain and bondingmedium are layed in side-by-side relation across'the strips I0 and I I.

Strips I3 and I 4 will also each be approximately 19 in width andaredisposed with a slight space between them as at I5, this space, beingapproximately the same as the space I2 and the strips being in parallelor substantially parallel relae.

tion. Now, a disc or wheel I6, as indicated by the dot and dash lines,is blanked from the laminated structure built up by the two layers ofstrips." The strips of one layer are angularly disposed with respect tothe strips of the other layer and pref? erably the strips-of one layerare at rightangles to those of the other layer whereby the spaces l2 andI5 intersect or cross at right angles. The point of intersection orcrossing of the medial lines of the spaces I2 and i5 will be the centeror the theoretical'center of the wheel I6. 2

As or after the wheel I 6 is blanked out, an arbor opening [7 is blankedthrough the center of the wheel as suggested by the dot and dashlines'in Fig; .1. f Makingthe wheel as described, it will be noted thateach strip (two strips in thepresent instance) of each layer extendsthrough two edges of the wheel. Further, the space I2 opens through oneside of the wheel, in Fig. 1 the near side,'while the space I5 opensthrough the back or far side. j

The wheel blanked from the laminated structure as described is cured intheusual or any desired manner. For example, if the bond isof rubher, itwill contain sulphur and the other necessary ingredients and the blankedwheel will be cured by vulcanization. If the bond is resino-id, theblank wheel will be cured by any of the known processes foraccomplishing the desired cure.

The structure of the resultant wheel, is better illustrated in Figs. 2,3 and 4, and there the same. is generally designated 20 andactuallycomprises two upper and two lower strips in the form ofsegments, designated respectively 21,12, 23 and provides a channel orgroove 26 1 24. Each segment shaped strip is approximately a half acircle but then the strips of the respective layers are slightly spacedfrom one another in their adjacent edges. Thus, the spacing of the thewheel in one face therethe strips '23 and 24.

Similarly, the spacing of the strips 23 and 24 extending dimetricallyacross the opposite face of "the Wheel and at right angles to thechannel 25 and which channel 26 is closed on its upper side by thestrips 2| and 22. Where all of the strips include the;

; same or a similar bonding medium, or'whe're the bonding medium of eachstripis compatible with the bonding material of each of the otherstrips,

the curing operating will result in the formation 1 y of a-homogeneousor substantially homogeneous structure. If desired, the. strips of onelayer may be secured to those of the other layer'by a suitable adhesive.This is suggestedin Figs. 3 and 4 where the respective layers of thelaminated structure are shown asseparated by dotted lines.

In using the present cut-off wheel, the channels 25 and 26 serve apurpose. in f or the carrying of a cooling medium directly into a outbeing made. Where these wheels operate in a Hood of coolant,the'channels will be filled with the coolant and as, each channel movesinto the cut, coolant, will be carried into the cut. The

coolant will be carried into the cut at alternate sides of the wheelsince the channels are at alternate sidesof thewheel.

The abrasive cutting wheel of the present. in.- vention and constructed,accordingto the. present method, is very practical and efiicient, forits;in-.

tended purpose. Since a substantially homogenous structure is provided,each segment of, the wheel, braces, the other segments. In addition toprovidingthe channels 25 and 22.6, the spacing of the strips. prior tothe blanking of them and the maintenance ofv this spacedrelation. keepsthe segments or strips of each layer from working against or causingbreakage or chipping of the, adjacent edge of the other segments orstrips .of said layer when the wheel is in use.

Having thus set forth the nature .of my Jim vention, what, I claim. is:

l. The method of making an abrasive cut-oil wheel comprising preparingstrips of abrasive grain and a. b.ond,,preparing aflaminated structureby laying a first pai'rof said strips in sideby-side: slightly spacedsubstantially parallel relation, laying a second pair of said stripsacross and substantially at right angles to the. strips of the firstpair and. in slightly spaced substan.- tially parallel relation to oneanother, blanking a disc from the. laminated structure so built up withthe center of said disc, substantially at the point of crossing of apair of lines bisecting the spaces between. the respective pairs ofstrips, and'then curing said blanked disc.

2. The. method. ,of making an abrasive cut-oil wheel comprisingpreparing strips. of abrasive grain and a bond, 'preparing a laminated.structure by laying up' layers of, said strips with the strips of .eachlayer longitudinally spaced from one another and the strips of eachlayer at an angle to those of thenext adjacent layer whereby the spacebetween the, stripsv of one layer cross the space between the strips ofthe next adjacent layer, blanking; a disc from the laminated-strait tureso built upwith each strip of each layer and the space between thestrips of each layer ear-- that they provide crossing spaced from oneanother and with suchstrips of each'layer at an angle to those of thenext adjacent layer whereby the space between the strips of onelayer-crosst'he space between the mentioned strips of the next adjacentlayer, blanking a disc from .the laminated structure so built upwithlfeachmentioned "strip of each layer and the spacegbetween eachmentioned strip of each layer extending to two edges of said disc, andthen curing said blanked disc.

.4. The-method of making an abrasive cut-off wheel comprising preparingstrips of abrasive grain and a bond, preparing a laminated structurebylaying up la ers o'f'said'strips Willhj ilhe strips of eachlayer'substantially'at "rightangles to those of the.nextfadj'acentlayer, blanking a disc from the laminated structure sobunt up with each strip H of each layerfextending fto edges of saiddisc,and then curingsaidblanked disc. T

5. The method of making an abrasivecut-off wheel comprising preparingiStilpS of abrasive grain an'cl'a bond, preparing a laminated struttture by laying up layers of said'stripswith at least two strips of eachlayer longitudinally.

spaced mm one another'and withsaidtwoi strips of onelayer substantiallyat right angles tothe said two strips of :the other layer, blankingadisc from'the lamina'tedstructure so built 'up'with each strip ofeachlayer extending totWo edges of" said disc, and then curing' saidblanked disc.

I 6. The methodof 'ma-kingan abrasive i cat-eff wheel comprisingpreparing strips {of abrasive grain and abond, preparing a lamii-iatedstruc ture by ,layinga; first pair of said strips ins "e by side'slightly spaced substantially parallel relationflaying a secondpair'ofsaid stripsacross and substantially at right angles-to the stripsof the first pair and in slightlyspaced substantially parallel relationto oneanother', blanking "adisc from the laminated structure sobuilt-=-up with the center of said disc substantially at thepoint of ofa pair of lines bisecting' 'tlie spacesbetween the respectivepairs ofstrips, 'h 'ng the bond or 'eachof said strips compatible-with th'e bondof each of the otherstripsgandthencuring said blanked discanddhering-engagi-ng strips through theirc'ompat' ble bonds whereb-yasub stantially homogenous structure is provided.

'7'. The method ofinaking an abrasiWe 'cutofi wheel comprising preparingstrips- 0f 1 bit grainand a bond, preparing a'l-amina ture-by laying uplayers of said stripslw'ith 'the strips of each layerlongitudinally-"spaced rmm one another and with-the strips ot each layerat an angle to those 0f" the nextadjacent ia'yer where-by the spacebetween the stri s of one layer- -cross the space between the Y stripsof the next adjacent layerfblanking a disc-from. I e

strips of said abrasive grain and bond, having at least two strips ofeach of said outer layers longitudinally spaced from one another andwith such strips of each such layer at an angle to such strips of theother such layer whereby the space between such strips of one outerlayer crosses the space between such strips of the other outer layer,blanking a disc from the laminated structure so built up with eachmentioned strip of the outer layers and the space between each suchmentioned strips extending to two edges of the disc, and then curingsuch blanked disc.

HUGH V. ALLISON.

REFERENCES CITED The following references are of record in the file ofthis patent: 4

5 UNITED STATES PATENTS Number Name Date 725,761 Nash Apr. 21, 1903927,164 Puffer July 6, 1909 10 1,616,531 King Feb. 8, 927 2,031,105 HallFeb. 18, 1936

